Hello Pietro di Castri:
K02 devices are not supported by CodeWarrior. All new Kinetis devices will be supported by Kinetis Design Studio.
There is an interesting article comparing CW with KDS by colleague Erich Styger:
Comparing CodeWarrior with Kinetis Design Studio | MCU on Eclipse
In KDS to add support for K02, please install the KSDK v1.1 mainline from this link and then install the Eclipse Update as in the attached guide.
KDS is free, although it is not he only option, please give a check to the next third party IDEs:
IDEs for Kinetis MCUs|Freescale
Regards!,
Jorge Gonzalez
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